support/docker/apt-sources.list: move to 20250218 snapshot

With the TARGETPLATFORM fix we need to rebuild the container so move to the
latest snapshot to get updated (security) fixes.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/docker/apt-sources.list

@@ -1,4 +1,4 @@
-# Latest just before 20250205151400Z:
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20250205T145632Z/ bookworm main
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20250205T145632Z/ bookworm-security main
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20250205T145632Z/ bookworm-updates main
+# Latest just before 20250218211000Z:
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20250218T144938Z/ bookworm main
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20250218T144938Z/ bookworm-security main
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20250218T144938Z/ bookworm-updates main